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The life total changes for a player only when it enters under that player's control

That exile aspect is really what pushes this from OK to good

CGC designates this specific style as a Blank Holo - Green/Yellow Background

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It's far worse than Time Spiral, because Spiral you can use the mana you get back however you want instead of being limited to casting one card, and also you can further abuse the untapped lands with mana doublers like High Tide

That sounds boring and very much not Mystery Booster 2